EP2693206B1 - Appareil de mesure de l'humidité destiné à déterminer la teneur en eau de la biomasse - Google Patents

Appareil de mesure de l'humidité destiné à déterminer la teneur en eau de la biomasse Download PDF

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Publication number
EP2693206B1
EP2693206B1 EP12178725.3A EP12178725A EP2693206B1 EP 2693206 B1 EP2693206 B1 EP 2693206B1 EP 12178725 A EP12178725 A EP 12178725A EP 2693206 B1 EP2693206 B1 EP 2693206B1
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Prior art keywords
wood chips
measuring
measured
water content
meter
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EP12178725.3A
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German (de)
English (en)
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EP2693206A1 (fr
Inventor
Maximilian Schaller
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Messtechnik Schaller GmbH
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Messtechnik Schaller GmbH
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
    • G01N27/223—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/46—Wood

Definitions

  • the invention relates to a measuring device for measuring the water content of chips with a measuring container for receiving the chips to be measured and with measuring means for feeding a measuring frequency having a measuring signal into the chips by means of measuring electrodes and for measuring the capacitive loss resistance and with a meter control for evaluating the measured capacitive Loss resistance and to display the measured water content of the wood chips and with a compression unit for compressing the chips in the measuring container is provided.
  • Such a measuring device for measuring the water content of biomass is available under the product name "Humimeter BM2".
  • This measuring device is intended, for example, for measuring wood chips, bark, pellets, miscanthus, maize spindle and planing and sawdust.
  • the measuring instrument is initially calibrated with an empty measuring container and then the biomass is introduced slowly and evenly into the measuring container by means of a 13-liter measuring bucket supplied with the meter. Care must be taken to ensure an even filling and to fill the measuring container with a certain biomass weight.
  • a characteristic curve for the evaluation by the meter control must be defined.
  • the measurement process is started, wherein the measurement signal passes through the biomass between plate-shaped electrodes.
  • the biomass forms a larger or a smaller capacitive loss resistance in the measuring circuit of the measuring means.
  • the meter control of the known meter evaluates the measured capacitive loss resistance based on the selected characteristic and displays the measured water content of the biomass on a display of the meter.
  • the disadvantage of the known measuring device is that the measurement result depends relatively strongly on the bulk density of the biomass in the measuring container. The lower the bulk density, the more air is between the parts of the biomass and the measured capacitive loss resistance is strongly influenced by these air inclusions. Users of the known measuring device therefore have to fill the biomass as uniformly as possible and always into the measuring container for each measurement in order to be able to compare the measurement results and not to distort the absolute value of the measured water content.
  • document US 2,025,465 A discloses a measuring device for measuring the water content of wool, in which the wool, cashmere or similar fibers are compressed by a piston in a cylinder.
  • the piston is moved in steps into the cylinder and, for each compression step, a capacitance measurement carried out. From this plurality of measurements, the water content of the wool can be determined from a table.
  • document WO 85/00427 A1 discloses a load cell for measuring the weight of grain, wherein the measured weight is used to determine the water content regardless of weight.
  • CA1080305 discloses a measuring device based on impedance measurements for the mathematical determination of the water content, the dry mass and bulk density of wood chips whose values are used to precisely adjust the mixing ratio water / wood pulp for papermaking. On a display, the temperature and the bulk density are displayed.
  • the invention has for its object to provide a measuring device and a method for measuring the water content of wood chips available, which provides a characteristic value for the actual calorific value per unit weight of the measured wood chips. According to the invention, this task is solved in the meter, in the meter a load cell for measuring the weight of wood chips in the measuring container is provided and that the meter control for displaying the dry mass of the measured wood chips, so the proportion of wood chips containing no water formed is.
  • this task is solved in the method, the weight of the chips is measured in the measuring container and that the dry mass of the measured wood chips, so the proportion of wood chips containing no water, is displayed.
  • FIG. 1 shows a block diagram of the functional blocks of a measuring device 1 for measuring the water content of biomass.
  • the measuring device 1 has a measuring container 2 for receiving the biomass 3 to be measured.
  • biomass 3 is hereby wood chips, barks, pellets, Miscanthus, corncob and planing sawdust and sawdust understood, with those skilled in the art also other minor parts resulting by natural or partly artificial processes resulting materials are known as biomass.
  • the measuring device 1 further comprises measuring means for feeding a measurement signal MS having a measuring frequency into the biomass 3 by means of measuring electrodes 4 and 5 for measuring the capacitive loss resistance.
  • the measuring electrodes 4 and 5 in this case form a capacitor in which the biomass 3 is contained as a dielectric.
  • the measuring electrodes 4 and 5 are represented symbolically in the block diagram as two capacitor plates provided in an electrically insulated manner on the outer wall of the measuring container 2.
  • the person skilled in the art is familiar with a multiplicity of other possibilities for positioning or forming measuring electrodes for measuring the capacitive loss resistance in the biomass 3.
  • the measuring device 1 further has a measuring device control 6 for evaluating the measured capacitive loss resistance and for displaying the measured water content of the biomass 3 at an in FIG. 1 not shown on display.
  • the meter control 6 is provided in addition to the control of other functions of the meter 1 and realized by a microcomputer.
  • a measuring signal source 7 is designed to generate and output the measurement signal MS having a measuring frequency to the measuring electrode 4.
  • the measuring signal MS passes through the biomass 3 from the measuring electrode 4 to the measuring electrode 5, whereupon the measuring signal MS influenced by the capacitive leakage resistance is emitted from the measuring electrode 5 to the appliance controller 6 for evaluation.
  • the measuring means for measuring the capacitive loss resistance are thus formed by the measuring signal source 7, the measuring electrodes 4 and 5 and a part of the device control 6.
  • the measuring device 1 now has a compression unit 8 for compressing the biomass 3 in the measuring container 2.
  • the compression unit 8 is formed by an electric motor 9 and a pressure plate 10 which presses the biomass 3 by the electric motor 9 with a compression pressure predetermined by the device control 6.
  • a hydraulic or pneumatic cylinder could be provided instead of the electric motor 9, a hydraulic or pneumatic cylinder could be provided.
  • the measuring device 1 now also has a weighing cell 15 integrated in the measuring device 1 for measuring the weight of the biomass 3 in the measuring container 2. Since the weight of the biomass 3 has an influence on the evaluation of the capacitive loss resistance by the device control 6, the device control 6 for determining the water content has to know the weight of the biomass 3 in the measuring container 2. This weight measurement can be carried out before introducing the biomass 3 into the measuring container 2. However, it is particularly advantageous to carry out this weight measurement with the load cell 15 integrated in the measuring device 1, which also measures the weight in the course of the measurement of the capacitive loss resistance and delivers it to the device control 6.
  • the measuring device 1 now also has temperature measuring means for measuring the temperature of the biomass in the measuring container 2, which are formed by an IR thermometer 11. Either before compression or, when the pressure plate 10 has been driven upwards again after being compressed by the electric motor 9, the IR thermometer 11 can measure the temperature directly on the surface of the biomass 3.
  • the pressure plate 10 is dashed in this raised position in FIG. 1 shown.
  • the reproducibility and the measuring accuracy of the measuring device 1 can be further improved by the consideration of the temperature of the biomass 3 in the determination of the water content by the device control 6.
  • the method described below is performed.
  • a button on measuring device 1 This is switched on and the load cell with the measuring container 2 is tared after query on the display.
  • the measuring container 2 is removed from the measuring device 1, the biomass 3 to be measured is introduced into the measuring container 2, and then the filled measuring container 2 is returned to the measuring device 2.
  • the user of the measuring device 1 must take no special care.
  • the type of biomass to be measured ie the type of material, is set on the measuring device 1 and the measuring process is started by means of a button.
  • the temperature of the biomass in the measuring container 2 is measured by means of the IR thermometer 11.
  • the device controller 6 controls the electric motor 9 and compresses the biomass 3 located in the measuring container 2 with a predetermined compression pressure or until a certain Komprimiermati is.
  • the compression pressure to be given may be about 500N, but it depends on the type of biomass and its particle size and strength.
  • the user after the first method step on the display of the measuring device 1, the user must inquire which type of biomass 3 should be measured. Depending on the input by the user of Komprimierdruck is specified by the device controller 6.
  • the measurement signal MS is introduced into the biomass 3 via the measurement electrodes 4 and 5 and the capacitive loss resistance measured in this case is output to the device controller 6.
  • the device controller 6 uses the respective characteristic curve typical for the type of biomass 3. The characteristic expresses the relationship between the measured capacitive loss resistance and the water content of the biomass 3. The determined by the device controller 6 based on the selected characteristic water content can then be displayed on the display of the meter 1.
  • the device control 6 displays the bulk density and the atro-weight / m 3 biomass on the display 12.
  • the bulk density before compressing the biomass 3 is displayed, which is particularly interesting for those users of the measuring device 1, which does not use a weighbridge for determining the weight of the supplied biomass 3 Have available.
  • the user of the measuring device 1 can calculate the weight of the supplied biomass 3 (for example, the wood chips) via the bulk density in conjunction with the delivered wood chips volume.
  • the device control 6 additionally also indicates the bulk density after compression. This bulk density shows how well the biomass 3 could be compressed in the measuring device 1 and this bulk density can be taken into account in the determination of the measured water content of the biomass 3, which will be discussed in more detail below.
  • the device control 6 takes into account the compression pressure given in the respective measurement when determining the water content of the biomass 3.
  • necessary calculations are known. As a result, the accuracy of the measurement can be further improved.
  • FIG. 2 shows an embodiment of the functional blocks of the measuring device 1 according to FIG. 1 in a front and a side view.
  • the housing 12 of the display in which the device control 6 is housed can be seen at the top of the housing 13 of the measuring device 1.
  • a door 14 for removing the measuring container 2 can be seen.
  • FIG. 3 shows a sectional view of the measuring device 1 according to FIG. 2 in a front and a side view.
  • the basis of FIG. 1 explained functional blocks are denoted by the same reference numerals in FIG. 3 characterized.
  • the measuring device control 6 of the measuring device 1 is further designed to display the dry mass of the measured biomass 3.
  • dry mass or dry matter the skilled person understands the proportion of biomass that contains no water. This recognized measure allows for immediate comparability of the financial value of different biomass of the same species but different water content. It may also be advantageous to display the bulk density directly on the measuring device 1.
  • moisture content of the wood moisture content

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  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Pathology (AREA)
  • Immunology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Biochemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Wood Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Food Science & Technology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Claims (10)

  1. Appareil de mesure (1) pour mesurer la teneur en eau de copeaux de bois (3), comportant un récipient de mesure (2) pour recevoir les copeaux de bois à mesurer (3) et comportant des moyens de mesure (4, 5, 6, 7) pour injecter dans les copeaux de bois (3) un signal de mesure (MS) ayant une fréquence de mesure à l'aide d'électrodes de mesure (4, 5) et pour mesurer la résistance de perte capacitive, et comportant
    une commande d'appareil de mesure (6) pour évaluer la résistance de perte capacitive mesurée et pour afficher la teneur en eau mesurée des copeaux de bois (3) sur un écran d'affichage de la commande d'appareil de mesure (6) et comportant une unité de compactage (8) pour compacter les copeaux de bois (3) dans le récipient de mesure (2),
    dans lequel
    une cellule de pesage (15) destinée à mesurer le poids des copeaux de bois (3) dans le récipient de mesure (2) est prévue dans l'appareil de mesure (1) et l'écran d'affichage de la commande d'appareil de mesure (6) affiche la masse sèche des copeaux de bois mesurés (3), donc la part de copeaux de bois (3) qui ne contient pas d'eau.
  2. Appareil de mesure (1) selon la revendication 1, caractérisé en ce que l'unité de compactage (8) pour compacter les copeaux de bois (3) est réalisée avec une pression de compactage prédéterminée.
  3. Appareil de mesure (1) selon la revendication 2, caractérisé en ce que la commande d'appareil de mesure (6) est réalisée pour prendre en compte la pression de compactage de l'unité de compactage (8) lors de la détermination de la teneur en eau mesurée des copeaux de bois (3).
  4. Appareil de mesure (1) selon l'une des revendications précédentes, caractérisé en ce que la commande d'appareil de mesure (6) est réalisée pour évaluer plusieurs mesures et pour afficher sur l'écran d'affichage une teneur en eau mesurée des copeaux de bois moyennée à partir des mesures.
  5. Appareil de mesure (1) selon l'une des revendications précédentes, caractérisé en ce que la commande d'appareil de mesure (6) affiche sur l'écran d'affichage la densité en vrac des copeaux de bois (3) avant le compactage et également après le compactage.
  6. Appareil de mesure (1) selon la revendication 5, caractérisé en ce que la commande d'appareil de mesure (6) est réalisée pour prendre en compte la densité en vrac des copeaux de bois atteinte par le compactage, lors de la détermination de la teneur en eau mesurée des copeaux de bois (3).
  7. Appareil de mesure (1) selon l'une des revendications précédentes, caractérisé en ce qu'il est prévu des moyens de mesure de température pour mesurer la température des copeaux de bois (3) dans le récipient de mesure (2).
  8. Appareil de mesure (1) selon la revendication 1, caractérisé en ce que la commande d'appareil de mesure (6) est réalisée pour prendre en compte la température mesurée des copeaux de bois (3) lors de la détermination de la teneur en eau mesurée des copeaux de bois (3).
  9. Procédé pour mesurer la teneur en eau de copeaux de bois (3), dans lequel on met en oeuvre les étapes suivantes consistant à :
    introduire les copeaux de bois à mesurer (3) dans un récipient de mesure (2) ;
    injecter un signal de mesure (MS) présentant une fréquence de mesure dans les copeaux de bois (3) à l'aide d'électrodes de mesure (4, 5) ;
    mesurer la résistance de perte capacitive ;
    évaluer la résistance de perte capacitive mesurée ;
    afficher la teneur en eau mesurée des copeaux de bois (3) sur un écran d'affichage de la commande d'appareil de mesure (6),
    dans lequel on compacte les copeaux de bois (3) après les avoir introduits dans le récipient de mesure (2) et avant de mesurer la résistance de perte capacitive,
    caractérisé en ce que
    on mesure le poids des copeaux de bois (3) dans le récipient de mesure (2), et en ce que l'on affiche sur un écran d'affichage de la commande d'appareil de mesure (6) la masse sèche des copeaux de bois mesurés (3), donc la part des copeaux de bois (3) qui ne contient pas d'eau.
  10. Procédé selon la revendication 9, caractérisé en ce qu'on prend en compte une pression de compactage donnée et la température des copeaux de bois (3) pour la détermination de la teneur en eau mesurée des copeaux de bois (3).
EP12178725.3A 2012-07-31 2012-07-31 Appareil de mesure de l'humidité destiné à déterminer la teneur en eau de la biomasse Active EP2693206B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12178725.3A EP2693206B1 (fr) 2012-07-31 2012-07-31 Appareil de mesure de l'humidité destiné à déterminer la teneur en eau de la biomasse

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EP12178725.3A EP2693206B1 (fr) 2012-07-31 2012-07-31 Appareil de mesure de l'humidité destiné à déterminer la teneur en eau de la biomasse

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EP2693206A1 EP2693206A1 (fr) 2014-02-05
EP2693206B1 true EP2693206B1 (fr) 2018-03-21

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR202016019177U2 (pt) * 2016-08-19 2018-03-06 Carlos Benjamin Baumgarten Julio Equipamento de controle e medição de umidade em secadores de grãos
US11022594B2 (en) 2018-04-24 2021-06-01 Transtech Systems, Inc. Parallel plate capacitor system for determining impedance characteristics of material under test (MUT)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3488758A (en) * 1966-09-14 1970-01-06 Kingsbury Technology Inc Apparatus for measuring a property of a material while processing it between movable members containing electrodes coupled to an oscillatory circuit
CA1080305A (fr) * 1976-10-12 1980-06-24 Fritz K. Preikschaf Electrode pour appareil de mesure d'impedance
WO1985000427A1 (fr) * 1983-07-01 1985-01-31 Oy Santasalo-Sohlberg Ab Hygrometre pour materiaux granulaires, en particulier pour grain
EP2228640A1 (fr) * 2009-03-09 2010-09-15 MICROTEC S.r.l. Procédé de mesure de la teneur en humidité du bois

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2993168A (en) * 1958-03-12 1961-07-18 Forte Fairbairn Inc Power-actuated testing mechanisms
US3025465A (en) * 1959-10-12 1962-03-13 Forte Fairbairn Inc Measurement of capacitivity of materials
US4021733A (en) * 1975-09-29 1977-05-03 Probe Engineering Company Limited Moisture meters
US4080563A (en) * 1976-11-08 1978-03-21 Dickey-John Corporation Haylage/silage moisture tester

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3488758A (en) * 1966-09-14 1970-01-06 Kingsbury Technology Inc Apparatus for measuring a property of a material while processing it between movable members containing electrodes coupled to an oscillatory circuit
CA1080305A (fr) * 1976-10-12 1980-06-24 Fritz K. Preikschaf Electrode pour appareil de mesure d'impedance
WO1985000427A1 (fr) * 1983-07-01 1985-01-31 Oy Santasalo-Sohlberg Ab Hygrometre pour materiaux granulaires, en particulier pour grain
EP2228640A1 (fr) * 2009-03-09 2010-09-15 MICROTEC S.r.l. Procédé de mesure de la teneur en humidité du bois

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